CN110957501B - Double-sided cross staggered porous flow field plate for methanol fuel cell and preparation method thereof - Google Patents
Double-sided cross staggered porous flow field plate for methanol fuel cell and preparation method thereof Download PDFInfo
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- CN110957501B CN110957501B CN201911358489.9A CN201911358489A CN110957501B CN 110957501 B CN110957501 B CN 110957501B CN 201911358489 A CN201911358489 A CN 201911358489A CN 110957501 B CN110957501 B CN 110957501B
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 239000000446 fuel Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000000758 substrate Substances 0.000 claims abstract description 27
- 238000005520 cutting process Methods 0.000 claims abstract description 16
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 238000011282 treatment Methods 0.000 claims abstract description 8
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 15
- 238000003754 machining Methods 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 14
- -1 polytetrafluoroethylene Polymers 0.000 claims description 14
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 14
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 14
- 239000000741 silica gel Substances 0.000 claims description 14
- 229910002027 silica gel Inorganic materials 0.000 claims description 14
- 238000002791 soaking Methods 0.000 claims description 14
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 13
- 239000012528 membrane Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000007514 turning Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000004220 aggregation Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- 230000005660 hydrophilic surface Effects 0.000 abstract description 2
- 239000002344 surface layer Substances 0.000 abstract description 2
- 238000007493 shaping process Methods 0.000 abstract 2
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000008030 elimination Effects 0.000 abstract 1
- 238000003379 elimination reaction Methods 0.000 abstract 1
- 230000007306 turnover Effects 0.000 abstract 1
- 230000002209 hydrophobic effect Effects 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000007605 air drying Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000003411 electrode reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 235000003642 hunger Nutrition 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000005459 micromachining Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000037351 starvation Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0247—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the form
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/1009—Fuel cells with solid electrolytes with one of the reactants being liquid, solid or liquid-charged
- H01M8/1011—Direct alcohol fuel cells [DAFC], e.g. direct methanol fuel cells [DMFC]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
Abstract
The invention discloses a double-sided cross staggered porous flow field plate for a methanol fuel cell and a preparation method thereof. The preparation method of the double-sided cross staggered porous flow field plate comprises the following steps: (1) cleaning a substrate; (2) primary plow cutting shaping of the base plate; (3) secondary plow cutting shaping of the turnover substrate; (4) Hydrophilic treatment of the double-sided cross staggered porous flow field plate. The two-sided grid-shaped grooves and corresponding hole structures of the double-sided cross staggered porous flow field plate are beneficial to the anode side CO 2 Can effectively solve the generation and the elimination of CO 2 The problem of blocking methanol supply by aggregation can be prevented, the phenomenon of hydrophilic surface layer falling off can be prevented, and the comprehensive performance of the battery can be promoted.
Description
Technical Field
The invention relates to the technical field of passive direct methanol fuel cells, in particular to a double-sided cross staggered porous flow field plate for a methanol fuel cell and a preparation method thereof.
Background
The development of human beings and society is not separated from energy, and the energy utilization mode based on fossil fuel at present has low conversion efficiency (the heat engine is generally 30% -40%), wastes resources, and can inevitably generate a large amount of harmful gas to seriously pollute the environment. And with some emerging fields (such as civil unmanned aerial vehicles, walking balance cars, etc.), increasingly different hot spot industries (such as consumer electronics products of mobile communication, mobile office, etc.), and even extremely high military fields (such as detection sensors, uninterrupted power supplies of radio devices, etc.), the traditional chemical batteries, such as lithium ion batteries and cadmium-nickel batteries, cannot meet the requirements in the aspects of structure, environmental protection, continuous service life, etc. more and more. In particular, existing products suffer from unprecedented bottlenecks in terms of energy (capacity) and cruising ability of the power supply. Under such a large background, the fuel cell technology has become a research hotspot at home and abroad again. The direct methanol fuel cell (DMFC for short) has the characteristics of rich raw materials, low working temperature, high theoretical specific energy, quick fueling, convenient storage of fuel, environmental protection, safe use and the like, and has good application prospect.
However, in passive direct methanol fuel cells, there have been fundamental scientific problems such as "poisoning" of the anode side due to methanol breakthrough, "flooding" of the cathode due to water breakthrough, and "water starvation" of the anode in steam cells (Li Miaomiao. Mu. DMFC anode flow field gas-liquid transport and flow field structure micromachining studies [ D]University of company, 2012). Wherein, the flow field plates with different structures can improve the problems, thereby improving the output performance of the battery. However, some existing flow field plates, such as grid-shaped flow field plates, are unfavorable for CO due to the overlarge open area 2 Bubble growth and discharge (Wang Aoyu. Visual study of direct methanol Fuel cell profiled flow field on product management [ D)]University of south China, 2018); the aperture flow field plate cannot align with anode CO 2 The effective dispersion of bubbles prevents the efficient performance of catalytic reactions (fabrication of ultra-hydrophobic porous flow field plates and mechanism of action in passive direct methanol fuel cells [ D ]]University of south China, 2016.).
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention discloses a double-sided cross staggered porous flow field plate for a methanol fuel cell and a preparation method thereof, wherein a matrix is formed by a double-sided (front and back) plow cutting process with a staggered angle of 90 degrees twice, and then ammonium persulfate solution treatment is combined to increase hydrophilicity, so that the absorption of product water is facilitated. The method has the advantages of simple manufacturing process, high efficiency and low cost, and is beneficial to the application of the method in passive liquid and gas direct methanol fuel cells.
The double-sided cross staggered porous flow field plate is provided with a plurality of holes, the front surface of the double-sided cross staggered porous flow field plate is provided with a plurality of parallel grooves, the back surface of the double-sided cross staggered porous flow field plate is provided with a plurality of grooves perpendicular to the grooves on the front surface, and the double-sided cross staggered porous flow field plate is soaked by ammonium persulfate solution.
Further, the porosity of the double-sided cross staggered porous flow field plate is 30% -50%.
Further, the thickness of the double-sided cross staggered porous flow field plate is 1-3 mm.
Further, the double-sided cross staggered porous flow field plate is made of copper plates, graphite plates, aluminum plates or stainless steel plates.
Further, the double-sided cross staggered porous flow field plate is formed by a double-sided plow cutting process with a staggered angle of 90 degrees.
The preparation method of the double-sided cross staggered porous flow field plate comprises the following steps:
(1) Cleaning a substrate: placing the substrate in acetone, carrying out ultrasonic soaking for 2-5 min, then cleaning by using deionized water, and drying by using a blast drying box;
(2) One plow cutting of the substrate into shapes: clamping the dried substrate in the step (1) on a vice of a squaring machine, calibrating the surface of the substrate to be horizontal by using a dial indicator, setting a cutter and setting a machining interval of 0.5-1 mm, wherein the machining depth is 60% -80% of the thickness of the substrate;
(3) Secondary plow cutting forming of the base plate: turning over the substrate after the step (2) is formed, calibrating the surface of the substrate to be horizontal again by using a dial indicator, setting a cutter and setting a machining interval to be 0.5-1 mm, wherein the machining depth is 60% -80% of the thickness of the substrate, and finishing machining to obtain the double-sided cross staggered porous flow field plate;
(4) Hydrophilic treatment of the double-sided cross staggered porous flow field plate: placing the double-sided cross staggered porous flow field plate obtained in the step (3) in acetone, ultrasonically soaking for 2-5 min, then cleaning with deionized water, drying with a blast drying box, completely soaking the double-sided cross staggered porous flow field plate on the anode side with ammonium persulfate solution, and soaking the double-sided cross staggered porous flow field plate on the cathode side with ammonium persulfate solution to the depth of one-step plow cutting formation.
Further, the concentration of the ammonium persulfate solution is 10-30wt%.
Further, the soaking time of the ammonium persulfate solution is 10-30 min.
The methanol fuel cell comprises a cathode end cover, a first silica gel gasket, a second silica gel gasket, a cathode side collector plate, an anode side collector plate, a first polytetrafluoroethylene gasket, a second polytetrafluoroethylene gasket, a proton exchange membrane and an anode fuel cavity; the cathode end cover, the first silica gel gasket, the cathode side current collecting plate, the first polytetrafluoroethylene gasket, the proton exchange membrane and the second polytetrafluoroethylene gasket are sequentially arranged, the anode side current collecting plate, the second silica gel gasket and the anode fuel cavity are respectively arranged on the cathode side current collecting plate, the anode side current collecting plate and the proton exchange membrane, double-sided cross staggered porous flow field plates are respectively arranged on the cathode side current collecting plate, the anode side current collecting plate and the proton exchange membrane, and the double-sided cross staggered porous flow field plates are arranged in the middle of the cathode side current collecting plate and the anode side current collecting plate.
Further, the double-sided cross staggered porous flow field plate on the cathode side current collecting plate and the double-sided cross staggered porous flow field plate on the anode side current collecting plate are symmetrical in center.
Compared with the prior art, the invention has the following advantages:
(1) The two-sided grid-shaped grooves and corresponding hole structures of the two-sided cross staggered porous flow field plate are beneficial to CO in the anode flow field plate 2 Can effectively solve the problem of CO 2 The problem of clogging of methanol supply by aggregation;
(2) The cathode side realizes water reverse compensation, so that water generated by the cathode side can be reversely compensated back to the anode side, flooding is prevented, and methanol penetration is indirectly blocked;
(3) Meanwhile, the plow cutting process is simple, the surface strength of the groove structure of the matrix is high, the phenomenon that the hydrophilic surface layer falls off is effectively prevented, and the battery performance is comprehensively improved.
Drawings
FIG. 1 is an assembled schematic view of a passive direct methanol fuel cell incorporating a double sided cross-staggered porous flow field plate of this embodiment;
FIG. 2 is a schematic illustration of the processing of a double sided cross-interleaved porous flow field plate of the present embodiment;
fig. 3 is an elevation view of a double sided cross staggered porous flow field plate of the present embodiment;
fig. 4 is a graph of the battery performance of the present example in the case where the methanol concentration is 8M;
in the figure: the cathode comprises a 1-cathode end cover, a 2-first silica gel gasket, a 21-second silica gel gasket, a 3-cathode side current collecting plate, a 31-anode side current collecting plate, a 4-first polytetrafluoroethylene gasket, a 41-second polytetrafluoroethylene gasket, a 5-proton exchange membrane, a 6-anode fuel cavity and a 7-double-sided cross staggered porous flow field plate.
Detailed Description
For a further understanding of the present invention, preferred embodiments of the invention are described in detail below. It should be noted that the scope of the present invention is not limited by the description of the embodiments. Those skilled in the art will appreciate that many insubstantial modifications and variations of the invention are possible in light of the above teachings.
As shown in fig. 1, a passive direct methanol fuel cell comprising a double-sided cross staggered porous flow field plate comprises a cathode end cover 1, a first silica gel gasket 2, a second silica gel gasket 21, a cathode side current collecting plate 3, an anode side current collecting plate 31, a first polytetrafluoroethylene gasket 4, a second polytetrafluoroethylene gasket 41, a proton exchange membrane 5 and an anode fuel cavity 6; the cathode end cover 1, the first silica gel gasket 2, the cathode side current collecting plate 3, the first polytetrafluoroethylene gasket 4, the proton exchange membrane 5 and the second polytetrafluoroethylene gasket 41 are sequentially arranged, the anode side current collecting plate 31, the second silica gel gasket 21 and the anode fuel cavity 6 are sequentially arranged, double-sided cross staggered porous flow field plates 7 are arranged on the cathode side current collecting plate 3, the anode side current collecting plate 31 and the proton exchange membrane 5, and the double-sided cross staggered porous flow field plates 7 are arranged between the plates of the cathode side current collecting plate 3 and the anode side current collecting plate 31.
The double-sided cross staggered porous flow field plate 7 on the cathode side collector plate 3 and the double-sided cross staggered porous flow field plate 7 on the anode side collector plate 31 are symmetrical in center.
The flow field plate is provided with a plurality of holes, the front surface of the double-sided cross staggered porous flow field plate 7 is provided with a plurality of parallel grooves, the back surface of the double-sided cross staggered porous flow field plate 7 is provided with a plurality of grooves perpendicular to the grooves on the front surface, and the double-sided cross staggered porous flow field plate 7 is soaked in ammonium persulfate solution.
The porosity of the double-sided cross staggered porous flow field plate 7 is 30% -50%, and the thickness is 1-3 mm.
The air-facing side of the double-sided cross-staggered porous flow field plate 7 on the cathode side collector plate 3 is hydrophobic. After machining is completed, if the flow field plate is not subjected to other special treatments, but is simply cleaned to remove impurities and oil stains, the porous flow field plate generally has certain hydrophobicity. Further improving the hydrophobicity of the collector plate, and soaking in NaOH (concentration of 3mol L) -1 ) And K 2 S 2 O 8 (concentration 0.2mol L) -1 ) Taking out the solution in deionized water for 5min, cleaning with deionized water, and air-drying; then preserving the heat for 2 hours at 500 ℃ in a protection furnace with hydrogen, taking out and soaking in 0.01mol L -1 And (3) putting the stearic acid into ethanol for 3 days, performing hydrophobic treatment, taking out, cleaning with acetone, and air-drying to obtain a hydrophobic structure. (because the cathode side of the passive direct methanol fuel cell can generate water during reaction, if the water cannot be effectively and timely discharged, water flooding phenomenon can be generated, the electrochemical reaction of the cell is further affected, the hydrophilic structure can timely absorb the water generated by the reaction, and the product water is discharged through the hydrophobic structure of the air side and cannot be adsorbed on the surface structure of the double-sided cross staggered porous flow field). The side of the double-sided cross staggered porous flow field plate 7 facing the proton exchange membrane 5 is a hydrophilic structure. After the flow field plate is treated by ammonium persulfate, the structure on the current collecting plate becomes finer, uniform and rough, and the water binding property is enhanced. As a means for further improving the hydrophobicity of the collector plate, naOH (concentration: 3mol L may be used -1 ) And K 2 S 2 O 8 (concentration 0.2mol L) -1 ) Taking out the solution in deionized water for 5min, cleaning with deionized water, and air-drying; a hydrophobic structure can be obtained. Meanwhile, the double-sided cross staggered porous flow field plate 7 of the anode-side current collector plate 31 is of a hydrophilic structure.
The principle of the double sided cross-staggered porous flow field plate 7 is as follows: on the cathode side, air enters the double-sided cross staggered porous flow field plate 7 on the cathode side collector plate 3 through the cathode end cover 1, and reaches the electrode area of the proton exchange membrane 5 to react, and the cathode reaction product water is enabled not to be discharged from the cathode side in a small amount under the hydrophobic repulsive action of the double-sided cross staggered porous flow field plate 7, is continuously accumulated and is diffused to the area with low water concentration of the anode area to participate in the electrode reaction of the anode area, so that the cathode water counter-compensation is realized. Meanwhile, the reverse compensation movement of water can inhibit the penetration of anode methanol to the cathode region, and has promotion effect on improving the output performance of the battery and improving the fuel utilization rate, and the double-sided cross staggered porous flow field plate 7 on the cathode side collector plate 3 can prevent the water loss of the anode, provide necessary water for the reaction at the anode side and ensure the smooth progress of the electrode reaction.
A method for preparing the double-sided cross staggered porous flow field plate adopts a copper plate as a matrix and comprises the following steps:
step (1), cleaning a copper substrate: placing the prepared copper substrate with the thickness of 1mm in acetone, carrying out ultrasonic soaking for 2min, then cleaning with deionized water, and drying with a blast drying oven;
step (2), cutting the copper substrate into a shape by one-time plow: and (3) clamping the copper plate dried in the step (1) on a vice of a squaring machine. Calibrating the surface of the copper matrix to be horizontal by using a dial indicator, setting machining spacing to be 0.5mm and machining depth to be 0.6mm (accounting for 60 percent of the thickness of the copper matrix);
step (3), secondary plow cutting forming of the copper substrate: and (3) turning over the copper substrate formed in the step (2), calibrating the surface of the copper substrate to be horizontal again by using a dial indicator, setting machining interval to be 0.5mm, and machining depth to be 0.6mm (accounting for 60% of the thickness of the copper substrate), so as to obtain the double-sided cross staggered porous flow field plate 7 shown in fig. 2.
And (4) hydrophilic treatment of the double-sided cross staggered porous flow field plate: placing the double-sided cross staggered porous flow field plate 7 formed by secondary plow cutting obtained in the step (3) into acetone, carrying out ultrasonic soaking for 2min, then cleaning by using deionized water, and drying by using a blast drying box. The double sided cross-staggered porous flow field plate 7 on the anode side was fully immersed for 10min with a 20wt% ammonium persulfate solution. The double-sided cross staggered porous flow field plate 7 on the cathode side was immersed to a depth of one plow cutting formation using an ammonium persulfate solution with a concentration of 20wt% for 10min, to obtain the double-sided cross staggered porous flow field plate 7 as shown in fig. 3.
The double-sided cross staggered porous flow field plate 7 on the anode side current collecting plate 31 is in a completely hydrophilic state after the current treatment, and the double-sided cross staggered porous flow field plate 7 on the cathode side current collecting plate 3 is in a hydrophobic state on one side and a hydrophilic state on the other side. At the same time, the porosity of the double-sided cross staggered porous flow field plate 7 reaches 50%.
The double-sided cross staggered porous flow field plate 7 prepared by the steps is assembled with a common open pore flow field plate in the mode of fig. 1 to form a passive direct methanol fuel cell, and is tested under the condition of 8M methanol concentration, as shown in fig. 4, the output power density of the double-sided cross staggered porous flow field plate 7 is found to reach 8mW cm -2 7mW cm than conventional apertured flow field plates -2 To be high, the effectiveness of the novel flow field plate is demonstrated.
Finally, it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be understood that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A preparation method of a double-sided cross staggered porous flow field plate is characterized by comprising the following steps of: the double-sided cross staggered porous flow field plate (7) is provided with a plurality of holes, the front surface of the double-sided cross staggered porous flow field plate (7) is provided with a plurality of parallel grooves, the back surface of the double-sided cross staggered porous flow field plate (7) is provided with a plurality of grooves perpendicular to the grooves on the front surface, and the double-sided cross staggered porous flow field plate (7) is soaked by ammonium persulfate solution; the preparation method comprises the following steps:
(1) Cleaning a substrate: placing the substrate in acetone, carrying out ultrasonic soaking for 2-5 min, then cleaning by using deionized water, and drying by using a blast drying box;
(2) One plow cutting of the substrate into shapes: clamping the substrate dried in the step (1) on a vice of a squaring machine, calibrating the surface of the substrate to be horizontal by using a dial indicator, setting a cutter and setting a machining interval of 0.5-1 mm, wherein the machining depth is 60-80% of the thickness of the substrate;
(3) Secondary plow cutting forming of the base plate: turning over the substrate after the step (2) is formed, calibrating the surface of the substrate to be horizontal again by using a dial indicator, setting a cutter and setting a machining interval to be 0.5-1 mm, wherein the machining depth is 60-80% of the thickness of the substrate, and finishing machining to obtain the double-sided cross staggered porous flow field plate (7);
(4) Hydrophilic treatment of the double-sided cross staggered porous flow field plate (7): placing the double-sided cross staggered porous flow field plate (7) obtained in the step (3) in acetone, carrying out ultrasonic soaking for 2-5 min, then using deionized water for cleaning, using a blast drying box for drying, using ammonium persulfate solution for completely soaking the double-sided cross staggered porous flow field plate (7) on the anode side, and using ammonium persulfate solution for soaking the double-sided cross staggered porous flow field plate (7) on the cathode side to the depth of one-step plow cutting formation.
2. A method of preparing a double sided cross staggered porous flow field plate as claimed in claim 1, wherein: the porosity of the double-sided cross staggered porous flow field plate (7) is 30% -50%.
3. A method of preparing a double sided cross staggered porous flow field plate as claimed in claim 1, wherein: the thickness of the double-sided cross staggered porous flow field plate (7) is 1-3 mm.
4. A method of preparing a double sided cross staggered porous flow field plate as claimed in claim 1, wherein: the double-sided cross staggered porous flow field plate (7) is made of copper plates, graphite plates, aluminum plates or stainless steel plates.
5. A method of preparing a double sided cross staggered porous flow field plate as claimed in claim 1, wherein: the double-sided cross staggered porous flow field plate (7) is formed by a double-sided plow cutting process with a staggered angle of 90 degrees.
6. The method of manufacturing according to claim 1, characterized in that: the concentration of the ammonium persulfate solution is 10-wt wt%.
7. The method of manufacturing according to claim 1, characterized in that: and the soaking time of the ammonium persulfate solution is 10-30 min.
8. A methanol fuel cell comprising a double sided cross staggered porous flow field plate as in claim 1, said methanol fuel cell being a passive direct methanol fuel cell characterized by: the passive direct methanol fuel cell comprises a cathode end cover (1), a first silica gel gasket (2), a second silica gel gasket (21), a cathode side current collecting plate (3), an anode side current collecting plate (31), a first polytetrafluoroethylene gasket (4), a second polytetrafluoroethylene gasket (41), a proton exchange membrane (5) and an anode fuel cavity (6); the cathode end cover (1), the first silica gel gasket (2), the cathode side current collecting plate (3), the first polytetrafluoroethylene gasket (4), the proton exchange membrane (5), the second polytetrafluoroethylene gasket (41), the anode side current collecting plate (31), the second silica gel gasket (21) and the anode fuel cavity (6) are sequentially arranged, double-sided cross staggered porous flow field plates (7) are arranged on the cathode side current collecting plate (3), the anode side current collecting plate (31) and the proton exchange membrane (5), and the double-sided cross staggered porous flow field plates (7) are arranged in the middle of the cathode side current collecting plate (3) and the anode side current collecting plate (31).
9. The passive direct methanol fuel cell as set forth in claim 8 wherein: the double-sided cross staggered porous flow field plate (7) on the cathode side current collecting plate (3) and the double-sided cross staggered porous flow field plate (7) on the anode side current collecting plate (31) are symmetrical in center.
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| CN115074748B (en) * | 2021-03-16 | 2024-04-26 | 清华大学 | Flow field plate |
| CN115395040A (en) * | 2022-09-20 | 2022-11-25 | 天津科技大学 | Passive fuel cell anode current collecting plate |
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